Quick answers
- Which hospitals does Roger Guillemette work at?
- Medicare's official clinician data lists Roger Guillemette at 5 hospitals: Barnes Jewish Hospital, Mercy Hospital South, Mercy Hospital St Louis, Missouri Baptist Medical Center and SSM Health St Mary's Hospital - St Louis. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Roger Guillemette see patients?
- Medicare's clinician data lists 4 practice locations, including Saint Louis, MO and O Fallon, MO. Call before your visit to confirm the address.
- What is Roger Guillemette's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Roger Guillemette accept Medicare assignment?
- Yes. Medicare's clinician data says Roger Guillemette accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Roger Guillemette?
- (314) 273-0195, as listed in official Medicare / NPI Registry data.
- What is Roger Guillemette's NPI number?
- 1417981333. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Roger Guillemette works
Medicare's Facility Affiliation Data lists Roger Guillemette at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Barnes Jewish HospitalSaint Louis, MO · Acute Care Hospital · CCN 260032
- Mercy Hospital SouthSaint Louis, MO · Acute Care Hospital · CCN 260077
- Mercy Hospital St LouisSaint Louis, MO · Acute Care Hospital · CCN 260020
- Missouri Baptist Medical CenterSaint Louis, MO · Acute Care Hospital · CCN 260108
- SSM Health St Mary's Hospital - St LouisSaint Louis, MO · Acute Care Hospital · CCN 260091
Practice locations
Addresses where Roger Guillemette is enrolled with Medicare (CMS data updated 2026-10-02).
- 1110 Highlands Plaza Dr ESaint Louis, MO 63110 (314) 273‑0195
- 2630 Hwy KO Fallon, MO 63368 (636) 240‑5454
- 3009 N Ballas RdSaint Louis, MO 63131
- 3015 N Ballas RdSaint Louis, MO 63131 (314) 996‑5772
Group practices
Medicare enrollment lists Roger Guillemette as a member of this group (CMS data updated 2026-10-02).
- Physician Groups LC521 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Geisel School Of Medicine At Dartmouth |
| Graduation year | 1992 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1417981333 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians